If you’re doing ADF, remember that your caloric deficit is built into the off day, so you should be eating at or close to maintenance on your eating day.
If that still doesn’t work and you feel like crap, then you might need to reconsider your fasting timing. Nothing wrong with changing things if they’re not meeting your needs.
I feel you. Struggled with that in week 3, too. As a previous poster said, everything changed when I stopped trying to achieve a calorie deficit on feasting days, too. Just eat at maintenance on these days. Really made a difference for me for my willpower on the following fasting day, and I am still loosing weight.